Buggy code:
public class SMTLibTranslator implements ASTVisitor { private LinkedList < Pair < KindOfProgram , Position > > descriptions ; private ArrayList < LinkedList < S_Expression > > programs ; private Stack < HashMap < VarDef , S_Expression > > upScopeReplacements ; private Stack < S_Expression > upScopeExpr ; private HashMap < String , Integer > arrays ; private S_Expression tempExpr ; private int currentProgram ; private boolean change ; private boolean isFunctionCall ; private ArrayList < FunctionCall > functionsCalled ; private int noOfFuncCall ; public WPProgram getWPTree ( ASTRoot ast ) { } public LinkedList < Pair < KindOfProgram , Position > > getDescriptions ( ) { } private static LinkedList < S_Expression > prepareFinalProgram ( ArrayList < LinkedList < S_Expression > > programs ) { } private static void createBlock ( LinkedList < S_Expression > program ) { } private static void replaceInAssignments ( Map < VarDef , S_Expression > map , VarDef varDef , S_Expression newExpr ) { } public static String getTypeString ( Type type ) { } private void prepareEndedLoop ( LinkedList < S_Expression > program ) { } @ Override public void visit ( Conditional conditional ) { } @ Override public void visit ( Loop loop ) { } @ Override public void visit ( ArrayAssignment arrayAssignment ) { } @ Override public void visit ( ArithmeticExpression arithmeticExpression ) { } @ Override public void visit ( NumericLiteral number ) { } @ Override public void visit ( LogicalExpression logicalExpression ) { } @ Override public void visit ( BooleanLiteral bool ) { } @ Override public void visit ( FunctionCall functionCall ) { } private void afterFunctionCall ( FunctionCall functionCall ) { } @ Override public void visit ( VariableRead variableRead ) { } @ Override public void visit ( ArrayRead arrayRead ) { } @ Override public void visit ( Function function ) { } @ Override public void visit ( Program program ) { } @ Override public void visit ( Assignment assignment ) { } @ Override public void visit ( Assertion assertion ) { } @ Override public void visit ( Assumption assumption ) { } @ Override public void visit ( Axiom axiom ) { } @ Override public void visit ( Ensure ensure ) { } @ Override public void visit ( Invariant invariant ) { } @ Override public void visit ( ReturnStatement returnStatement ) { } @ Override public void visit ( VariableDeclaration varDec ) { S_Expression expression = tempExpr ; if ( ( varDec . getValue ( ) ) != null ) { varDec . getValue ( ) . accept ( this ) ; } else { if ( ( varDec . getType ( ) ) instanceof BooleanType ) { <START_BUG> tempExpr = new Constant ( "true" ) ; <END_BUG> } else { tempExpr = new Constant ( "0" ) ; } } VarDef varDef = new VarDef ( varDec . getName ( ) , varDec . getType ( ) , 0 ) ; expression . replace ( varDef , tempExpr ) ; SMTLibTranslator . replaceInAssignments ( upScopeReplacements . lastElement ( ) , varDef , tempExpr ) ; upScopeReplacements . lastElement ( ) . remove ( varDef ) ; } @ Override public void visit ( ArrayDeclaration arrDec ) { } @ Override public void visit ( ExistsQuantifier existsQuantifier ) { } @ Override public void visit ( ForAllQuantifier forAllQuantifier ) { } @ Override public void visit ( StatementBlock statementBlock ) { } private String getMangledArrayName ( String name , boolean replace ) { } }

Fix:
tempExpr = new Constant ( "false" ) ;